== Preparations for edits to Square root article

Every nonnegative real number x has a unique nonnegative square root, called the principal square root, which is denoted by {\displaystyle {\sqrt {x}},}{\displaystyle {\sqrt {x}},} where the symbol {\displaystyle {\sqrt {~^{~}}}}{\displaystyle {\sqrt {~^{~}}}} is called the radical sign or radix. For example, to express the fact that the principal square root of 9 is 3, we write {\displaystyle {\sqrt {9}}=3}{\displaystyle {\sqrt {9}}=3}.